[Co-Op][Game] Instantiating issues in Act 3

In Act 3 after opening the gateway* at the top of present day's ziggurat, if P1 leaves a player-portal open in "the past" from a solo game session, and then P1 and P2 tries to start a game session in "the present", while the player-portal instance is still open, the game camera is stuck centered at the bridge of present-day's waypoint and the rest of the camp.

Nothing else renders and there is no way to interact with anything. The only way to "fix" this, is for P1 to start a solo game session and then travel to the correct "timeline". Lastly, exit to character selection so that both players can start a game session in the same "timeline" as the portal.

I have not tried the opposite (leave the portal in the present and try to start a game in the past), but following the steps above has consistently bugged out with the camera stuck as described.